OUTPUT DEVICE 2.5.4 / STORAGE 2.5.5

• An output device that produces text andgraphics on a physical medium such as paper.• Printed information, called hardcopy, existsphysically and is more permanent thansoftcopy.

Impact printers

– Forms characters and graphics on a piece of paperby striking a mechanism against an inked ribbonthat physically contacts the paper.– Noisy, and print quality is slightly less clear– Used in business for routine jobs such as printinglabels or multilayers forms.– Examples of impact printer are dot-matrix printerand line printer.

Nonimpact printers

– Form characters and graphics on a piece of paperwithout actually striking the paper.– Form characters and graphics by spraying ink,using heat, or using pressure.– Quiet, and better print quality

– A display that uses an array of light-emittingdiodes to produce images.– Offers better color quality, clarity, and betterenergy savings.

Video output

LCD Projector

– A type of video projector for displaying video,images or computer data on a screen or other flatsurface.– It is a modern equivalent of the slide projector oroverhead projector.

HDTV

– HDTV (high definition television) is a the mostadvance form of digital television that providevery high resolution.– Often used as output for game consoles such asMicrosoft’s Xbox and others.– Users plug one end of a cable in the game consoleand the other end in the video port of thetelevision.

Characteristics of Storage• Storage is non-volatile; it does not lose itscontents even when the power is off.• Storage has bigger capacity compared tomemory, which has limited capacity.• Transfer rate of storage is slower comparedwith the transfer rate of memory.

Types of Storage Media

Optical Disc

• Storage media that consists of flat, round,portable disc made of metal, plastic andlacquer that is written and read by a laser.• Stores data in deformities on the surface of acircular disc and reads this data byilluminating the surface with a laser diode andobserving the reflection

DVD

• A type of optical disc used to store videos,films, and large programs.• Higher storage capacity and better imagequality compared to CD.• Types of DVD:– DVD-ROM, DVD-R, and DVD-RW

BD

Types of Storage Media: Optical Disc:Blu-Ray Disc• A type of optical disc used to store highdefinitionand ultra high-definition videos andmovies.• It uses a blue laser instead of a red laser toread and write data on the disc.

• Flash memory storage that offers faster data transferrate, used in all types of computers and mobile devices.• May eventually replace storage media with movingparts such as hard disk and optical disc.

Characteristics of hard disk:– Capable to store large amount of data.– Direct access device; a file can be accessrandomly, not following the sequence it is stored.– Faster data access compared to tape.

Tape

• Magnetically coated ribbon of plastic capableof storing large amount of data.• Tape is mainly used for storing backup data.

Characteristics :– Capable to store large amount of data.– Sequential access device; a file have to beaccessed in sequence.– Slower data access compared to hard disk.